2,6-Naphthalenedisulfonic acid, 4-((4-((4-amino-1-naphthalenyl)azo)-1-naphthalenyl)azo)-, sodium salt 4-((4-((4-Amino-1-naphthyl)azo)-1-naphthyl)azo)naphthalene-2,6-disulphonic acid, sodium salt 85283-74-5 EINECS 286-601-0